add document for star
Merge pull request #39 from yzprofile/master

update variables document
fix typo
Merge pull request #40 from jinglong/master

add document for star
released tengine-1.4.4
fixed typo
added docs of http_upstream_session_sticky_cn.html
Merge pull request #42 from yaoweibin/tengine-1.4.4

Tengine 1.4.4
fix menu